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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        var time = prompt('请您输入1~24点中任意一个时间点');
        if (time > 0 && time <= 8) {
            alert('早上好');
        } else if (time <= 12) {
            alert('中午好');
        } else if (time <= 17) {
            alert('下午好');
        } else if (time <= 18) {
            alert('傍晚好');
        } else if (time <= 22) {
            alert('晚上好');
        } else {
            alert('深夜好');
        }
    </script>
</head>


<body>

</body>

</html>